S-90403A115 4-40 x 3/4" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior vibration resistance with integrated internal-tooth lock washer that maintains clamping force under dynamic loads
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in harsh environments
- High tensile strength performance rated at 60,000 psi for reliable fastening in demanding applications
- Optimized drive engagement with Phillips No. 1 drive style providing efficient installation torque transfer
- Precise thread compatibility with Class 2A UNC coarse threads ensuring consistent mating with standard components
- Complete threading coverage along the 3/4" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.13 standards and environmental regulations for global applications
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws with internal-tooth lock washers provide critical vibration-resistant fastening solutions for industrial equipment, electronic enclosures, and machinery assemblies. The combination of 4-40 UNC coarse threading and Class 2A thread fit ensures reliable engagement in materials where fine threads might strip, while the pan head design with Phillips drive offers low-profile installation with standard tooling. The integrated locking mechanism prevents loosening from operational vibrations, eliminating the need for additional locking components and reducing assembly time. With 60,000 psi tensile strength and Rockwell B69 hardness, these screws maintain structural integrity under mechanical stress, making them ideal for applications requiring repeated disassembly and reassembly cycles.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading specifications. Fully compliant with ASME B18.13 manufacturing standards, ensuring consistent quality and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. The zinc-plated steel construction provides corrosion resistance while maintaining the mechanical properties required for industrial fastening applications.
